还差回退机制

backend/src/main/java/com/example/cattletends/controller/CattleDataController.java

@@ -392,7 +392,7 @@ public class CattleDataController {
     @ResponseStatus(HttpStatus.CREATED)
     public Result<CattleData> createCattleData(
             @ApiParam(value = "牛只数据信息", required = true)
-            @Valid @RequestBody CattleDataDTO dto) {
+            @Valid @ModelAttribute CattleDataDTO dto) {
         CattleData data = cattleDataService.createCattleData(dto);
         return Result.success("创建成功", data);
     }

backend/src/main/java/com/example/cattletends/exception/GlobalExceptionHandler.java

@@ -4,6 +4,7 @@ import com.example.cattletends.common.Result;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.converter.HttpMessageNotReadableException;
 import org.springframework.validation.FieldError;
 import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
@@ -37,6 +38,22 @@ public class GlobalExceptionHandler {
         return Result.error(400, "参数校验失败", errors);
     }
 
+    /**
+     * 处理请求体缺失或格式错误异常
+     */
+    @ExceptionHandler(HttpMessageNotReadableException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public Result<Void> handleHttpMessageNotReadableException(HttpMessageNotReadableException ex) {
+        String message = ex.getMessage();
+        if (message != null && message.contains("Required request body is missing")) {
+            logger.warn("请求体缺失: {}", ex.getMessage());
+            return Result.error(400, "请求体不能为空，请提供JSON格式的请求数据");
+        } else {
+            logger.warn("请求体格式错误: {}", ex.getMessage());
+            return Result.error(400, "请求体格式错误，请检查JSON格式是否正确");
+        }
+    }
+
     /**
      * 处理业务异常
      */